Camshaft arrangement

ABSTRACT

A camshaft arrangement includes an adjustable camshaft and an adjuster for adjusting the camshaft. The adjustable camshaft includes an outer shaft and an inner shaft arranged rotatably in the outer shaft. The adjuster includes a stator connected with the outer shaft in a rotationally fixed manner, and a rotor connected in a rotationally fixed inner with the inner shaft via an axially inserted coupling. A bush is connected with the rotor in a rotationally fixed manner and has at least one channel for supplying a lubricant. The bush has on a face side that axially faces the inner shaft a form that together with a counter-form on the inner shaft provides the axially inserted coupling.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to German Application No. DE 10 2019217 295.4 filed Nov. 8, 2019, the contents of which are herebyincorporated by reference in its entirety.

TECHNICAL FIELD

The present invention relates to a camshaft arrangement with anadjustable camshaft and with an adjuster for adjusting the camshaft. Theinvention relates furthermore to an internal combustion engine systemwith an internal combustion engine and with such a camshaft arrangement.

BACKGROUND

A camshaft usually comes into use for the actuating of valves of aninternal combustion engine. For this purpose, the camshaft has camsarranged on a shaft in a rotationally fixed manner, which cams actuaterespectively associated valves accordingly.

In order to increase the variability of the actuation of the valves,so-called adjustable camshafts, also designated as phase-adjustablecamshafts, are known for example from DE 10 2015 224 012 A1. Such acamshaft has an outer shaft and an inner shaft arranged in the outershaft, which inner shaft is rotatable relative to the outer shaft. Therespective shaft is connected with associated cams, so that a relativerotation between the inner shaft and the outer shaft leads to a phaseshift between the cams of the outer shaft and the cams of the innershaft.

In the production and in the operation of such adjustable camshafts, itis important to precisely maintain a relative alignment of the innershaft to the outer shaft, as offsets between the inner shaft and theouter shaft lead to increased friction and therefore in particular to anincreased wear and/or a reduced lifespan. In addition, such offsets canlead to a jamming of the inner shaft on the outer shaft, which disturbsthe operation of the camshaft and/or blocks an adjusting of thecamshaft.

For adjusting the camshaft, i.e. for the relative rotational movementbetween the inner shaft and the outer shaft, usually adjusters are used,which are connected with a stator in a rotationally fixed manner, andwith a rotor in a rotationally fixed manner with the inner shaft.

Such a camshaft arrangement with an adjustable camshaft and with anassociated adjuster is known from DE 10 2014 206 291 A1. In DE 10 2014206 291 A1 it is proposed to connect the rotor of the adjuster with theinner shaft via an Oldham coupling, in order to compensate offsetsbetween the inner shaft and the outer shaft in axial and angulardirection. Here, a contour or form is provided on the inner shaft, and acounter-form or counter-contour is provided on an intermediate partwhich is connected with the rotor in a rotationally fixed manner, forthe formation of the Oldham coupling. In addition, a sleeve forsupplying the camshaft arrangement with a fluid for the simultaneousactuation and lubrication penetrates axially through the intermediatepart, and into the inner shaft.

A disadvantage in camshaft arrangements which are known from the priorart are the complicated construction and the continual lack ofcompensation of offsets between the inner shaft and the outer shaft.

SUMMARY

The present invention is therefore concerned with the problem ofindicating, for a camshaft arrangement of the above-mentioned type andfor an internal combustion engine system with such a camshaftarrangement, improved or at least different embodiments, which inparticular are distinguished by a simplified construction and/or by animproved compensation of offsets.

This problem is solved according to the invention by the subjects of theindependent claims. Advantageous embodiments are the subject of thedependent claims.

The present invention is based on the general idea of realizing, in acamshaft arrangement with an adjustable camshaft and with an adjusterfor adjusting the camshaft, an axially inserted form-fitting connectionas a coupling between a rotor of the adjuster and an inner shaft of thecamshaft via an already present bush for supplying the arrangement withlubricant. Therefore, an additional intermediate part for realizing theform-fitting connection between the rotor and the inner shaft can bedispensed with, and the construction of the camshaft arrangement canthus be simplified. The omission of the additional intermediate partleads, furthermore, to an improved compensation of offsets between theinner shaft and the outer shaft of the camshaft, in particular ofoffsets in axial direction and/or angular offsets, i.e. offsets incircumferential direction.

In accordance with the idea of the invention, the camshaft arrangementhas the adjustable camshaft and the adjuster. The camshaft has an outershaft and an inner shaft arranged rotatably in the outer shaft, whereinthe outer shaft and the inner shaft are respectively connected in arotationally fixed manner with at least one associated cam. The adjusterhas a stator and the rotor. Here, the stator is connected with the outershaft in a rotationally fixed manner. The rotor is connected in arotationally fixed manner with the bush, by which a supply of thearrangement with lubricant takes place. The bush has here at least onechannel which in operation is connected with a connection for thefluidic supply of the arrangement by lubricant, wherein the connectionis provided on an outer casing of the arrangement. According to theinvention, the bush has on its face side facing the inner shaft axially,a form which, with a counter-form on the inner shaft, forms the axiallyinserted form-fitting connection and thus the coupling. With therealizing of the coupling between the rotor and the inner shaft via thebush, therefore with a simple construction a compensation of axialoffsets and/or radial offsets of the inner shaft to the outer shafttakes place.

The directions indicated in the present case refer in particular to anaxis of the outer shaft. The axial direction therefore corresponds inparticular to the rotation axis of the outer shaft. The angulardirection corresponds accordingly to the circumferential directionsurrounding the axial direction. The lateral direction correspondsaccordingly to a radial direction running perpendicularly to the axialdirection. Accordingly, axial offsets of the inner shaft to the outershaft are relative displacements of the inner shaft to the outer shaftin axial direction, angular offsets are relative movements of the innershaft to the outer shaft in circumferential direction and lateraloffsets are relative movements of the inner shaft to the outer shaft inradial direction.

An axially inserted form-fitting connection and therefore an axiallyinserted coupling is to be understood here to mean a coupling having theform on the bush and the counter-form on the inner shaft, wherein theform and counter-form are inserted axially into one another andtherefore produce a rotationally fixed connection between the innershaft and the rotor, which is connected with the bush in a rotationallyfixed manner.

The coupling is preferably configured as an Oldham coupling. Thecoupling can therefore be implemented easily and at a favourable cost.

It is also conceivable to configure the coupling as an elastomercoupling.

In addition to lubricating, the lubricant also serves for actuation, inparticular for adjusting the inner shaft relative to the outer shaft.Accordingly, the lubricant is preferably a fluid. In particular, thelubricant is lubricating oil. The bush is therefore in particular an oilguide bush.

The bush is expediently arranged axially between the rotor and the innershaft. It is preferred when the bush is connected not only in arotationally fixed manner with the rotor, but is fixed on the rotor, sothat the bush is also connected axially and laterally securely with therotor.

The counter-form provided on the inner shaft can be formed integrally onthe inner shaft. Therefore, a simple construction of the arrangement anda reliable compensation of offsets with the aid of the coupling arepossible.

It is also conceivable to provide between the face side of the bush andtherefore between the form and the inner shaft an intermediate part withthe counter-form, which is arranged on the inner shaft.

Embodiments are preferred in which the outer shaft projects axially overthe inner shaft, on the side facing the bush, with a receiving section,wherein the bush is rotatably arranged in the receiving section of theouter shaft. This means that the bush is received and rotatably arrangedin the outer shaft. This leads to a compact construction of the camshaftarrangement and a simple implementation of the coupling.

Embodiments prove to be advantageous in which at least one elastic sealis arranged between a radial inner side of the outer shaft, hereinbelowalso designated as outer shaft inner side, in the receiving section, anda radial outer side of the bush, hereinafter also designated as bushouter side. Therefore, a fluidic sealing of the receiving region isachieved. In particular, the flowing of the lubricant from the receivingregion is thus prevented or at least reduced. It is preferred here if atleast two seals, spaced apart axially with respect to one another, areprovided. An axial flowing of the lubricant in both axial directions isthus at least reduced.

It is preferred if at least one of the at least one seals is arrangedand received in an associated, radially open outer groove in the outershaft inner side or respectively in the bush outer side, advantageouslyin the bush outer side.

It is preferred here when the seal is arranged radially between the bushouter side and the associated slide ring.

Advantageously, an associated slide ring is arranged radially between atleast one of the at least one seals, preferably the respective seal, andthe outer shaft inner side or the bush outer side. Preferably, the slidering is arranged radially between the associated seal and the outershaft inner side. The slide ring serves here for the protection of theseal during relative movements, in particular rotations, between theouter shaft and the inner shaft. Thus, in particular, the transmissionof shearing forces to the seal is prevented or at least reduced.Consequently, damage to the seal is reduced, so that a sealing takesplace with the seal for a longer duration.

At least one of the at least one slide rings is advantageously a slottedslide ring, i.e. interrupted in circumferential direction. The slidering can therefore be mounted in particular in a simplified manner.Rectangular rings are also conceivable.

The elastic seal can be configured basically in any desired manner. Inparticular, the seal is a ring seal. This leads to a homogeneous and/orimproved sealing effect. Embodiments are also conceivable in the form ofslide- or respectively rectangular rings with reduced adhesion- andsliding friction coefficient for an improved response behaviour andreduced losses in operation. In particular PTFE-coated rings areadvantageous for this.

With the at least one seal and the coupling, the bush is advantageouslyarranged radially freely in the outer shaft. This means in particular tobe spaced apart more radially between the bush to the outer shaft and/orthat a bearing of the bush in the outer shaft can be dispensed with.Therefore, the outer shaft and/or the bush can be produced in asimplified manner. In particular, the outer shaft can be producedradially on the inner side and/or the bush can be produced radially onthe outer side with higher tolerances. In particular, a fine processingof the outer shaft inner side can be dispensed with. In addition, inthis way a simpler relative positioning of the rotor to the inner shaftis possible. In particular, in this way an exact lateral positioning ofthe rotor to the inner shaft can be dispensed with.

Alternatively or additionally, the rotor can be rotatably mounted via aradially exterior outer side of the outer shaft, hereinbelow alsodesignated as outer shaft outer side. In particular, the rotor can berotatably mounted exclusively via the outer shaft outer side. This leadsin particular to the fact that a separate processing of the outer shaftinner side can be dispensed with, so that the outer shaft as a whole canbe produced at a more favourable cost. In particular, it is thuspossible to produce the outer shaft inner side with increasedtolerances. At the same time, via the rotatably mounting of the rotor onthe outer shaft outer side, a compensation and/or reduction of lateraloffsets between the inner shaft and the outer shaft is achieved.

The mounting of the rotor on the outer shaft outer side isadvantageously realized in such a way that the outer shaft has an axialprojection which penetrates into the adjuster, in particular projectsover the bush in axial direction. Here, the rotor is rotatably mountedon the outer shaft outer side of the projection. This leads inparticular to the mounting of the rotor on the outer shaft beingimplemented in an installation-space-saving and efficient manner. Inparticular, in this way, owing to the vicinity of the rotor to theprojection, a simple mounting of the rotor on the outer shaft can takeplace.

The rotationally fixed connection of the rotor with the bush, inparticular the fixing of the rotor on the bush, is preferably realizedvia a pin which can be a component part of a screw. In particular, thepin can have an external thread which forms a screw connection with aninternal thread of the bush. Here, a screw head or a nut of the screwconnection can act upon the rotor axially against the bush, in such away that a rotationally fixed connection of the rotor with the bush isprovided.

The pin has advantageously in the interior a cavity, which is alsodesigned hereinbelow as pin cavity. It is preferred here if the pincavity is fluidically connected with the interior of the bush, inparticular a cavity formed in the interior of the bush, designatedhereinbelow also as bush cavity. In this way, it is possible inparticular to realize the feeding and the discharging of the lubricantvia the bush and the pin.

The camshaft arrangement expediently has a drive wheel which serves fordriving the camshaft. The drive wheel is expediently connected with thestator in a rotationally fixed manner. The drive wheel can be driven inan associated system with an internal combustion engine, hereinbelowalso designated internal combustion engine system, by a crankshaft ofthe internal combustion engine. Here, the drive wheel can be, inparticular, a spur wheel.

It is conceivable here to form the drive wheel and the stator in asingle part. This means in particular that the drive wheel and thestator can be fixed to one another via a materially bonded connection ora force-fitting connection.

In addition, it is conceivable to form the drive wheel and the stator ina single piece. In particular, the drive wheel and the stator can beproduced jointly, for example by sintering.

An easy centring of the stator to the outer shaft can be achieved whenthe stator is connected directly or indirectly with the receivingsection of the outer shaft. Thus, an easy centring of the adjusterrelative to the outer shaft and/or to the inner shaft also takes place.

For centring the adjuster, alternatively or additionally at least onecentring collar can be provided, for example on the drive wheel.

The bush can have, as mentioned above, a bush cavity which in particularserves for supplying the arrangement with the lubricant. The bush cavityis expediently closed on the side axially facing the form and thereforeon the side axially facing the inner shaft.

The bush preferably has at least two channels, spaced axially withrespect to one another, which are connected respectively fluidicallywith the bush cavity, wherein the channels are arranged axially betweentwo slide rings. This leads to an improved mounting of the bush andtherefore of the rotor in the inner shaft. It is advantageous here iffor the respective slide ring an associated seal of the described type,therefore an elastic seal in radial direction, is provided. Thus inparticular the region which is flowed through fluidically in operationis sealed in an improved manner.

It is advantageous if the bush in addition has at least two suchchannels spaced apart from one another in circumferential direction.Consequently in operation an improved supplying of the arrangement withlubricant takes place.

It shall be understood that in addition to the camshaft arrangement alsoan internal combustion engine system with such a camshaft arrangementbelongs to the scope of this invention. The internal combustion enginesystem comprises, in addition to the camshaft arrangement, the internalcombustion engine which has at least two valves which are actuated inoperation by the cams of the camshaft.

Further important features and advantages of the invention will emergefrom the subclaims, from the drawings and from the associated figuredescription with the aid of the drawings.

It shall be understood that the features mentioned above and to beexplained further below are able to be used not only in the respectivelyindicated combination, but also in other combinations or in isolation,without departing from the scope of the present invention.

Preferred example embodiments of the invention are illustrated in thedrawings and are explained in further detail in the followingdescription, wherein the same reference numbers refer to identical orsimilar or functionally identical components.

BRIEF DESCRIPTION OF THE DRAWINGS

There are shown, respectively schematically

FIG. 1 a lateral view, partially in section, of a camshaft arrangement,

FIG. 2 a frontal view onto a bush of the camshaft arrangement,

FIG. 3 a longitudinal section through the bush,

FIG. 4 an isometric view of the bush,

FIG. 5 a section through the camshaft arrangement in the region of thebush,

FIG. 6 an isometric view of a slide ring of the camshaft arrangement,

FIG. 7 a longitudinal section through the camshaft arrangement inanother example embodiment.

DETAILED DESCRIPTION

A camshaft arrangement 1, as shown for example in FIGS. 1 to 7, servesin an otherwise not shown internal combustion engine system 2 for theactuation of valves, which are not shown, of an internal combustionengine, which is not shown. As can be seen in particular from FIG. 1,the camshaft arrangement 1 has an adjustable camshaft 3 with a hollowouter shaft 4 and an inner shaft 5, which is rotatably arranged in theouter shaft 4. The outer shaft 4 is rotatable about a rotation axis 6,which corresponds to an axial direction 7. In an optimum arrangement,the inner shaft 5 and the outer shaft 4 are coaxially arranged, i.e. theinner shaft 5 and the outer shaft 4 have the same rotation axis 6. Onthe outer shaft 4 at least one associated cam 8 is mounted in arotationally fixed manner, by which a valve of the internal combustionengine can be actuated. In addition, an associated cam 38 is mounted ina rotationally fixed manner on the inner shaft 5, by which a valve ofthe internal combustion engine can be actuated. The camshaft arrangement1 of FIG. 1 can have, furthermore, a drive wheel 9, which is connectedwith the outer shaft 4 in a rotationally fixed manner and thus rotatesthe outer shaft 4. For the relative rotating of the inner shaft 5 to theouter shaft 4 and thus for adjusting the camshaft 3, the camshaftarrangement 1 has an adjuster 10. The adjuster 10 has a stator 11 whichis connected with the outer shaft 4 in a rotationally fixed manner. Thestator 11 is connected, for example via screw connections 13, with thedrive wheel 9 in a rotationally fixed manner. The adjuster 10 has, inaddition, a rotor 12 connected with the inner shaft 5 in a rotationallyfixed manner, which rotor is rotatable relative to the stator 11,wherein this takes place via a corresponding rotation of the rotor 12 tothe stator 11. In the example embodiment shown in FIG. 1, the stator 11is arranged radially between the drive wheel 9 and the outer shaft 4.The rotor 12 is arranged axially on the face side of the drive wheel 9.In FIG. 1 a side view of the camshaft arrangement 1 can be seen, whereinthe camshaft arrangement 1 is shown axially between the adjuster 10 andthe inner shaft 5 in an axially running longitudinal section, which runscentrally radially.

As can be seen from FIG. 1, the camshaft arrangement 1, hereinbelow alsoabbreviated as arrangement 1, has a bush 14 which serves for supplyingthe arrangement 1 with a lubricant, in particular with oil. Thelubricant, in addition to lubricating, serves furthermore for theactuation, in particular for the relative moving, of the inner shaft 5to the outer shaft 4. For this purpose, in operation the bush 4 issupplied fluidically with the lubricant via at least one connection 15provided on an outer casing of the arrangement 1, wherein in the exampleembodiment shown in FIG. 1 two such connections 15 are provided, one ofwhich serves for the feeding of the lubricant and the other serves forthe discharging of the lubricant. For the respective connection 15, thebush 14 has at least one channel 16, which fluidically connects a cavity17, formed in the interior of the bush 14, hereinbelow also designatedas bush cavity 17, with the associated connection 15. In the exampleswhich are shown, the bush 14 has for the respective connection 15 atleast two associated channels 16, which are spaced apart from oneanother in a circumferential direction 37. The respective channel 16runs here radially through the bush 14.

As can be seen in particular from FIG. 1, the rotor 12 is connected viathe bush 14 in a rotationally fixed manner with the inner shaft 5. Here,the bush 14 is arranged axially between the rotor 12 and the inner shaft5. For the rotationally fixed connection of the rotor 12 with the innershaft 5, the bush 14 has, on its face side 18 facing the inner shaft 5axially, a form 19 which is axially inserted with a counter-form 20 onthe inner shaft 4 and thus forms an axially inserted coupling 21. Forthis purpose, in the example embodiments which are shown, anintermediate piece 23, having the counter-form 20, is mounted on theinner shaft 5 in a rotationally fixed manner and Is arranged axiallybetween the face side 18 of the bush 14 and the inner shaft 5. FIG. 2shows here a frontal view in axial direction 7 onto the face side 18 andthus onto the form 19, and FIG. 3 shows the section, designed by III inFIG. 2, in axial direction 7 through the bush 14. FIG. 4 shows anisometric view of the bush 14.

In the example embodiments which are shown, the coupling 21 isconfigured as an Oldham coupling 22.

As can be seen in particular from FIG. 3, in the example embodimentswhich are shown, the bush 14 is configured to be closed on the sidefacing the face side 18 and to be open on the side facing away from theface side 18. In the example embodiments which are shown, therotationally fixed connection of the rotor 12 with the bush 14 takesplace via a pin 24, which is a component part of a screw 25 with a screwhead 26. For this purpose, the pin 24 has an external thread, which isnot shown, which interacts with an internal thread, not shown, in thecavity 17 of the bush 14, wherein the screw head 26 presses the rotor 12axially in the direction of the bush 14 and thus connects the rotor 12with the bush 14 in a rotationally secure manner.

As can be seen from FIG. 1, the pin 24 in the example embodiments whichare shown is of hollow design and has in its interior a cavity 27, whichis also designated below as pin cavity 27. The pin cavity 27 is open onthe side axially facing the bush 14 or respectively the inner shaft 5,so that the pin cavity 27 and the bush cavity 17 are fluidicallyconnected with one another.

As can be seen from FIGS. 1, 3 and 4, the outer shaft 4 projects inaxial direction 7 beyond the inner shaft 5 and has a receiving section28 projecting over the inner shaft 5, in which receiving section thebush 14 is received and rotatably arranged. Here, the connections 15 arerespectively formed in the receiving section 28 of the outer shaft 4.Hereby, via the drive wheel 9, which is connected with the stator 11 andis mounted on the receiving section 28, a centring of the adjuster 10,in particular of the stator 11, to the outer shaft 4 also takes place.

As can be seen in particular from viewing FIGS. 1, 3 and 4 together, inthe example embodiment shown in FIGS. 1 to 5, the bush 14, andconsequently the rotor 12, is arranged rotatably within the receivingsection 28. Here, the outer shaft 4 has a radially interior inner side29, also designated below as outer shaft inner side 29. The bush 14 hasa radially exterior outer side 30, also designated below as bush outerside 30. Radially between the outer shaft inner side 29 and the bushouter side 30, at least one elastic seal 32, in particular a ring seal33, is arranged, by which in particular a flowing off of the lubricantis prevented or at least reduced. In the example embodiment which isshown, two such seals 32 are used, which are spaced apart from oneanother in axial direction 7, wherein the channels 18 of the bush 14 andthe connections 15 are arranged axially between the seals 32.Consequently, a flowing off of the lubricant in both directions isprevented or at least reduced. The bush 14 has here on the bush outerside 30 for the respective seal 32 a radially outwardly open and annularouter groove 34, in which the seal 32 is received.

In FIG. 5 a section is shown through the camshaft arrangement 1 in theregion of such a seal 32.

As can be seen in particular from FIG. 5, an associated slide ring 31 isarranged radially between the respective seal 32 and the outer shaftinner side 29 or the bush outer side 30. In the example embodiment whichis shown, and preferably, the respective slide ring 31 is arrangedradially between the seal 32 and the outer shaft inner side 29. With theslide ring, a protection takes place of the associated seal 32 withrespect to relative movements, in particular rotations, between theinner shaft 5 and the outer shaft 4. Such a slide ring 31 is illustratedin FIG. 6 separately and isometrically. It can be seen from FIG. 6 thatthe slide ring 31 is interrupted in circumferential direction 37 and isthus configured to be slotted.

The seals 32 and the coupling 21 allow the bush 14 to be positionedradially freely in the outer shaft 4. A mounting of the bush 14 in theouter shaft 4 can thus be dispensed with.

Another example embodiment of the camshaft arrangement 1 is shown inFIG. 7, wherein FIG. 7 shows a section through the camshaft arrangement1 in axial direction 7 and thus a longitudinal section, and wherein therotor 12 is not illustrated. The example embodiment shown in FIG. 7differs from the example embodiment shown in FIGS. 1 to 6 in that therotor 12, which is not shown in FIG. 7, is rotatably mounted on aradially exterior outer side 35 of the outer shaft 4, also designatedbelow as outer shaft outer side 35. The bush 14 is thus also rotatablymounted via the rotor 12 on the outer shaft outer side 35, so that amounting on the outer shaft inner side 29 can be dispensed with. Formounting the rotor 12 on the outer shaft outer side 35, the outer shaft4 in the example embodiment shown in FIG. 7 has a projection 36penetrating axially into the adjuster 10, wherein the rotor 12 isrotatably mounted on the outer shaft outer side 35 of the projection 36.Here, seals 32, in particular ring seals 33, radially between the outershaft inner side 29 and the bush outer side 30, can be received in theouter grooves 34, in order to achieve a corresponding sealing. In theexample embodiment shown in FIG. 7, it is illustrated that the stator 11for rotationally fixed connection with the outer shaft 4 can be mountedon the outer shaft outer side 35 in a rotationally fixed manner, inparticular can be shrunk on.

The respective camshaft arrangement 1 compensates via the coupling 21 anaxial and angular offset between the inner shaft 5 and the outer shaft4. Through the mounting of the rotor 12 and of the bush 14 on the outershaft, in addition a lateral offset is compensated between the innershaft 5 and the outer shaft 4. In addition, in this way the respectivecamshaft arrangement 1 is able to be produced in a compact and simplemanner.

1-11. (canceled)
 12. A camshaft arrangement, comprising: an adjustablecamshaft and an adjuster for adjusting the camshaft, the camshaft havingan outer shaft and an inner shaft arranged rotatably in the outer shaft,the outer shaft and the inner shaft respectively connected with at leastone associated cam in a rotationally fixed manner, the adjusterincluding a stator connected with the outer shaft in a rotationallyfixed manner, and a rotor, the rotor connected in a rotationally fixedmanner with the inner shaft via an axially inserted coupling, such thata rotation of the rotor relative to the stator leads to a relativerotation of the inner shaft to the outer shaft, a bush connected withthe rotor in a rotationally fixed manner and has at least one channelfor supplying a lubricant, the at least one channel in operation forsupplying with lubricant is fluidicially connected with a connectionprovided on an outer casing, and wherein the bush has on a face sidethat axially faces the inner shaft a form that together with acounter-form on the inner shaft provides the axially inserted coupling.13. The camshaft arrangement according to claim 12, wherein the couplingis configured as an Oldham coupling.
 14. The camshaft arrangementaccording to claim 12, wherein: the outer shaft projects axially overthe inner shaft with a receiving section on the side facing the bush,and the bush is rotatably arranged in the receiving section.
 15. Thecamshaft arrangement according to claim 14, further comprising at leastone elastic seal arranged radially between an outer shaft inner side ofthe receiving section and a bush outer side of the bush.
 16. Thecamshaft arrangement according to claim 15, further comprising a slidering arranged radially between the outer shaft inner side or the bushouter side and the at least one elastic seal.
 17. The camshaftarrangement according to claim 12, wherein the bush is arranged radiallyfreely in the outer shaft.
 18. The camshaft arrangement according toclaim 12, wherein the rotor is rotatably mounted via a radially exteriorouter shaft outer side of the outer shaft.
 19. The camshaft arrangementaccording to claim 18, wherein: the outer shaft has a projection,protruding axially and penetrating into the adjuster, and the rotor isrotatably mounted on the outer shaft outer side of the projection. 20.The camshaft arrangement according to claim 12, further comprising: apin that penetrates axially into the bush and connects the bush with therotor in a rotationally fixed manner, and wherein the pin has a pincavity that is fluidically connected with the interior of the bush. 21.The camshaft arrangement according to claim 12, further comprising adrive wheel for driving the camshaft, wherein the drive wheel is formedin one part with the stator.
 22. The camshaft arrangement according toclaim 15, wherein: the bush has a bush cavity that is closed on the sidefacing the form, the bush has at least two channels, spaced axially withrespect to one another, and are respectively connected fluidically withthe bush cavity, and the at least two channels are arranged axiallybetween two seals.
 23. An internal combustion engine system, comprising:an internal combustion engine having at least two valves, and a camshaftarrangement for actuating the at least two valves, the camshaftarrangement including: an adjustable camshaft and an adjuster foradjusting the camshaft, the camshaft having an outer shaft and an innershaft arranged rotatably in the outer shaft, the outer shaft and theinner shaft respectively connected with at least one associated cam in arotationally fixed manner, the adjuster including a stator connectedwith the outer shaft in a rotationally fixed manner, and a rotor, therotor connected in a rotationally fixed manner with the inner shaft viaan axially inserted coupling, such that a rotation of the rotor relativeto the stator leads to a relative rotation of the inner shaft to theouter shaft, a bush connected with the rotor in a rotationally fixedmanner and having at least one channel for supplying a lubricant, the atleast one channel in operation for supplying with lubricant isfluidicially connected with a connection provided on an outer casing,wherein the bush has on a face side that axially faces the inner shaft aform that together with a counter-form on the inner shaft provides theaxially inserted coupling.
 24. The internal combustion engine systemaccording to claim 23, wherein the axially inserted coupling isconfigured as an Oldham coupling.
 25. The internal combustion enginesystem according to claim 23, wherein the outer shaft projects axiallyover the inner shaft with a receiving section on the side facing thebush, and the bush is rotatably arranged in the receiving section. 26.The internal combustion engine system according to claim 25, wherein thecamshaft arrangement further includes at least one elastic seal arrangedradially between an outer shaft inner side of the receiving section anda bush outer side of the bush.
 27. The internal combustion engine systemaccording to claim 25, wherein the bush is arranged radially freely inthe outer shaft.
 28. The internal combustion engine system according toclaim 23, wherein the rotor is rotatably mounted via a radially exteriorouter shaft side of the outer shaft.
 29. The internal combustion enginesystem according to claim 28, wherein the outer shaft has a projectionprotruding axially and penetrating into the adjuster, and wherein therotor is rotatably mounted on the outer shaft outer side of theprojection.
 30. The internal combustion engine system according to claim23, further comprising a pin that penetrates axially into the bush andconnects the bush with the rotor in a rotationally fixed manner, whereinthe pin has a pin cavity that is fluidically connected with an interiorof the bush.
 31. The internal combustion engine system according toclaim 23, further comprising a drive wheel for driving the camshaft,wherein the drive wheel is formed in one part with the stator.